Strictly speaking, cloning is the creation of a genetic copy of a sequence of DNA or of the entire genome of an organism. In the latter sense, cloning occurs naturally in the birth of identical twins and other multiples.
The secondary nutrients, calcium (Ca), magnesium (Mg) and sulfur (S), are as important to plant nutrition as the primary nutrients. Deficiency in secondary nutrients, including Ca, can depress plant growth as much as primary nutrient deficiencies do.he secondary nutrients, calcium (Ca), magnesium (Mg) and sulfur (S), are as important to plant nutrition as the primary nutrients. Deficiency in secondary nutrients, including Ca, can depress plant growth as much as primary nutrient deficiencies do.
Iron deficiency is a limiting factor of plant growth. Iron is present at high quantities in soils, but its availability to plants is usually very low, and therefore iron deficiency is a common problem.ron deficiency is a limiting factor of plant growth. Iron is present at high quantities in soils, but its availability to plants is usually very low, and therefore iron deficiency is a common problem.